Chainslap - How to get rid!

mf-racing
mf-racing Posts: 149
edited June 2008 in MTB workshop & tech
Hi guys,

This is on my new Trek Fuel EX9 running full 08 XT, with the shadow version of the rear mech.

I'm suffering from really noise chain slap when descending, it’s especially bad in the granny and middle rings, and only slightly better in the big ring. I have a fabric chain stay protector fitted (came with the bike) but it does not seem to dampen the noise that much.

I'm thinking taking a few links out of the chain but when I’m in big/big gears even now the rear mech looks a bit stretched out, so I’m not sure if this is the answer?

Years ago, you could buy chain devices that stopped all this by holding the chain up by the chainstay or extra springs pulling the rear mech back.

Any idea on what I can do? Maybe fitting a better rear mech will help (XTR)?

Cheers
Matt

:D
2009 Trek Remedy 9
Megavalance 2010 - Done!
Megavalance 2011 - In-training!
www.mf-racing.co.uk

Comments

  • ratty2k
    ratty2k Posts: 3,872
    Not much you can do really, I wrapped an old innertube round the chainstay on my old Trek which helped deaden the noise. Just a case of putting up with it tho' really.
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  • defcone
    defcone Posts: 6
    Have you tried the tension screw on the rear derailleur? If that doesnt work, maybe your chain is too long.
  • mf-racing
    mf-racing Posts: 149
    defcone wrote:
    Have you tried the tension screw on the rear derailleur? If that doesnt work, maybe your chain is too long.

    Nope, is that the B-screw? What does it do?
    2009 Trek Remedy 9
    Megavalance 2010 - Done!
    Megavalance 2011 - In-training!
    www.mf-racing.co.uk
  • defcone
    defcone Posts: 6
    Im not sure, on my X-9 rear dérailleur, by tightening that tension screw, the rear dérailleur will extend, giving more tension to the chain.
  • boyfriday
    boyfriday Posts: 103
    For what it's worth, i have the xtr shadow mech and it makes not a jot of difference.

    Huge rattling chain slap affects me too, so an expensive rear mech will not solve your problems.

    I will follow this thread though as i'd be interested in ways of cutting it out.
  • nicklouse
    nicklouse Posts: 50,673
    Go Sram.

    i thought the Shadow mechs were also meant to reduce the slap...
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  • S_J_P
    S_J_P Posts: 908
    The Shadow mech doesn't smack the chainstay in the same way as a standard mech can ('cos the body doesn't sit below the chainstay!) and the spring-tension is a lot higher than on the Deore derailler I had on previously, but the chain can still waft about.
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  • artillerydave
    artillerydave Posts: 715
    earplugs! :lol:
  • beski
    beski Posts: 542
    Using big front ring & middle cog on rear helps. & a Lizard Skin on your chain stay
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